Pneumatic-despatch apparatus.



W. A, BROWN. PNBUMATIC DESPATGH APPARATUS.

APPLICATION FILED MAB.. 30, 1908.

Patented Sept. 7, 1909. 2 SHEETS-SHEET 1.

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W. A. BROWN. PNBUMATIC DESPATGH APPARATUS.

APPLICATION FILED MAR. 30, 1908. I n

Patented Sept. 7, 1909.

v @fifa/77g unir-En STATES -OFFC-f" WLLIAM A. BROWN, CHICAGO, ILLINOIS.

PNEUMATIC-DESPATCH APPARATUS.

To all whom it 'may concern.'

Be it known that I, WILLIAM A. BROWN, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Pneumatic-DespatchApparatus, of whichvthe following is a specification. 7

My invention relates to pneumatic despatch apparatus, and the primaryobject thereof is to provide apparatus to minimize the sound caused bythe carrier and particularly when in the act of delivery of the carrier.

An important feature of my invention consists in means disposed in thepath of the carrier to oppose the momentum thereof.

A further feature of my invention consists in a muffler extensioncomprising an elbow -like structure with an oppositely curved openingtherethrough.

With the above and other objects in view, my invention consists in thenovel features and in the combination and arrangement of partshereinafter more specifically described, illustrated in the accompanyingdrawings, and particularly pointed out in the claims hereunto appended.

Like numerals of reference denote like parts in all of the figures inthe accompanying two sheets of drawings forming a part of thisspecication.

Figure 1 is a vertical central section. Fig. 2 is a side elevation. Fig.3 is a vertical section. Fig. 4 is a cross section on line 4 4 ofFig. 1. kF ig. 5 is a section on line 5-5 of Fig. 1. Fig. 6 is a sectionon line 6-6 of Fig. 1. Fig. 7 is a detail view.

Referring to the drawingsl by reference numerals, 8 denotes the usualtransit tube, and 9 the usual pipe leading to the suction fan or vacuummeans (not shown).

For the purpose of minimizing the noise of the carrier, particularly atthe time of delivery, I have provided means, hereinafter described,normally disposed in the path of the carrier and capable of opposing butyielding to the momentum of the carrier to permit delivery thereof. Inthe delivery tube 10 there are lateral openings 11 extending lengthwiseof the tube and covered by air-tight housings 11a, in each of which ispositioned a strip 12 of felt or other material which is a non-conductorof sound or vibra- Specfcationrof Letters Patent.

Application filed March 30, 1908.

Patented Sept. 7, 1909.

Serial No. 424,224. Y

tion. At one end of each housing there is pivotally disposed one end ofan arm 13 which `preferably is made of metal, but it may be made of anysuitable or desired material, and faced at 14 with a material which is anon-conductor of sound or vibration, such as leather A spring element 15urges the arm toward the axial center of the tube The arm 13 is pivotedat 16 through an ova' aperture 17 in one end and the opposite end may becaused to move from appronimatel;V the axial center of the tube throughan arc of a circle to a plane outside the bore of the tube. At theopposite end of each arm is pivotally attached a sliding Valve or gate1S with a metal reinforcing plate 19 suitably secured thereto. The metaleye 20 secured to the valve is movably secured to the bifurcated end 21of the arm by bolt 22. One end of the delivery tube has fixed theretocollar 24 with flange 25, which has bolted thereto plate 25a by means ofbolts 26. Cast with, or otherwise attached to plate 25a is a rectangularextension 27.

For the purpose of interposing additional means to check the momentum ofthe carrier and prevent sound or noise caused by the impact of thecarrier with the parts, I employ what is termed a mufiier extension, theside walls 28 of which have internal beads 29. The front and rear wallsof the muier extension are provided with metal strips 30 and leatherstrip 31. The structure is secured together by means of bolts 32, andissupported by form 33, and comprises a frame with oppositely curvedopening therethrough lined on two walls with a material which is anon-conductor of sound or vibration. ln Fig. 2 the c arrier 34approaching` delivery is shown in dotted lines.

The oval apertures 17 through the ends of the arms will permit thevalves to be drawn air tight against the end of the delivery tube. Theadjacent edges of the leather valves will be kept in air tightengagement by the action of the spring element 15, excepting when themomentum v of the carrier overcomes the force of the spring elements.

In operation when the valves 18 are drawn apart the suction or action ofthe air-forcing means (not shown) becomes effective in the well knownmanner to restrain the outward movement of the carrier.

It is apparent the mufHer extension may be omitted and the opening belowthe valves 18 Willbecome .the carrier exit.

It is thought the operation of my invention Will be manifest onreference to the drawings and foregoing description.

Variation in the form, arrangement and construction above described ispossible, and Idesire, therefore, not toA limit my invention to suchdescription of the preferred formv in which it has been embodied.

Having thus fully described my invention,

what I claim as new, and desire to secure byY Letters-Patent, is- Y l. Apneumatic despatch apparatus, comprising a delivery tube, a carrier,means for moving the carrier, in combination With a muffler-extensioncomposed of a frame having an oppositely curved passage therethroughpartly lined With a material which is a non-conductorl of sound,substantially as shown and described. Y

2. In a pneumatic despatch apparatus, in combination, a delivery tubehaving a pluralit-y of openings in the Wall thereof, a piv. oted armcapable of movement in each opening, a closure valve connected with oneend 0f each arm the adjacent faces of the arms' being faced With amaterial Which is a nonconductor of sound or vibration, and a mufflerextension having an oppositely .curved f 'opening therethrough.

In testimony whereof I aHiX my signature in presence of twoy Witnesses.-Y

' Y WILLIAMA. BROWN, lVitnesses:

vMevr CANNON,

S. ELVA KELLoGG.

